mei: make a local copy of client uuid in connect

Connect ioctl has the same memory for in and out parameters.
Copy in parameter (client uuid) to the local stack to avoid it be
overwritten by out parameters fill.

Signed-off-by: Alexander Usyskin <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
Link: https://lore.kernel.org/r/[email protected]

Author: ausyskin

drivers/misc/mei/main.c

@@ -646,7 +646,7 @@ static long mei_ioctl(struct file *file, unsigned int cmd, unsigned long data)
 	struct mei_cl *cl = file->private_data;
 	struct mei_connect_client_data conn;
 	struct mei_connect_client_data_vtag conn_vtag;
-	const uuid_le *cl_uuid;
+	uuid_le cl_uuid;
 	struct mei_client *props;
 	u8 vtag;
 	u32 notify_get, notify_req;
@@ -674,18 +674,18 @@ static long mei_ioctl(struct file *file, unsigned int cmd, unsigned long data)
 			rets = -EFAULT;
 			goto out;
 		}
-		cl_uuid = &conn.in_client_uuid;
+		cl_uuid = conn.in_client_uuid;
 		props = &conn.out_client_properties;
 		vtag = 0;
 
-		rets = mei_vt_support_check(dev, cl_uuid);
+		rets = mei_vt_support_check(dev, &cl_uuid);
 		if (rets == -ENOTTY)
 			goto out;
 		if (!rets)
-			rets = mei_ioctl_connect_vtag(file, cl_uuid, props,
+			rets = mei_ioctl_connect_vtag(file, &cl_uuid, props,
 						      vtag);
 		else
-			rets = mei_ioctl_connect_client(file, cl_uuid, props);
+			rets = mei_ioctl_connect_client(file, &cl_uuid, props);
 		if (rets)
 			goto out;
 
@@ -707,14 +707,14 @@ static long mei_ioctl(struct file *file, unsigned int cmd, unsigned long data)
 			goto out;
 		}
 
-		cl_uuid = &conn_vtag.connect.in_client_uuid;
+		cl_uuid = conn_vtag.connect.in_client_uuid;
 		props = &conn_vtag.out_client_properties;
 		vtag = conn_vtag.connect.vtag;
 
-		rets = mei_vt_support_check(dev, cl_uuid);
+		rets = mei_vt_support_check(dev, &cl_uuid);
 		if (rets == -EOPNOTSUPP)
 			cl_dbg(dev, cl, "FW Client %pUl does not support vtags\n",
-				cl_uuid);
+				&cl_uuid);
 		if (rets)
 			goto out;
 
@@ -724,7 +724,7 @@ static long mei_ioctl(struct file *file, unsigned int cmd, unsigned long data)
 			goto out;
 		}
 
-		rets = mei_ioctl_connect_vtag(file, cl_uuid, props, vtag);
+		rets = mei_ioctl_connect_vtag(file, &cl_uuid, props, vtag);
 		if (rets)
 			goto out;